WPF中button按鈕同時點擊屢次觸發click解決方法

        DateTime lastClick = DateTime.Now;
        object obj = new object();
        int i = 0;
        private  void Button_Click(object sender, RoutedEventArgs e)
        {
            this.IsEnabled = false;      
            var t = (DateTime.Now - lastClick).TotalMilliseconds;
            i++;
            lastClick = DateTime.Now;
            System.Diagnostics.Debug.Print(t + "," + i + ";" + DateTime.Now);
            Thread.Sleep(2000);         
            this.IsEnabled = true;
        }

以上代碼並無法解決用戶點擊兩次按鈕觸發兩次的問題,由於ui線程是單線程的,因此這個這樣會致使用戶連續點擊兩次,會兩秒後又調用Button_Click一次,輸出以下:

1207.069,1;2017年4月19日 13:58:22
2055.1176,2;2017年4月19日 13:58:24

因此要在this.IsEnabled = false;後面強制界面刷新,代碼以下:

   private  void Button_Click(object sender, RoutedEventArgs e)
        {
            this.IsEnabled = false;
            DispatcherHelper.DoEvents();
            var t = (DateTime.Now - lastClick).TotalMilliseconds;
            i++;
            lastClick = DateTime.Now;
            System.Diagnostics.Debug.Print(t + "," + i + ";" + DateTime.Now);
            Thread.Sleep(2000);         
            this.IsEnabled = true;
        }
        public static class DispatcherHelper
        {
            [SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
            public static void DoEvents()
            {
                DispatcherFrame frame = new DispatcherFrame();
                Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(ExitFrames), frame);
                try { Dispatcher.PushFrame(frame); }
                catch (InvalidOperationException) { }
            }
            private static object ExitFrames(object frame)
            {
                ((DispatcherFrame)frame).Continue = false;
                return null;
            }
        }

 DispatcherHelper.DoEvents();這個方法會強制界面刷新,問題就解決了